实验六继承与派生.docx

1、实验六继承与派生实验六-继承与派生继承与组合一、实验目的1了解继承在面向对象程序设计中的重要作用。2进一步理解继承与派生的概念。3掌握通过继承派生出一个新的类的方法。4了解虚基类的作用和用法。5掌握类的组合二、实验内容1请先阅读下面的程序，写出程序运行的结果，然后再上机运行程序，验证自己分析的结果是否正确。(1)#include using namespace std;class Apublic: A()coutA:A() called.n; virtual A()coutA:A() called.n; class B:public A public: B(int i) coutB:B() c

2、alled.n; buf=new chari; virtual B() delete buf; coutB:B() called.n; private: char *buf; ; void fun(A *a) coutMay you succeed!endl; delete a; int main() A *a=new B(15); fun(a); return 0;1、（1）程序运行结果：A:A() called.B:B() called.May you succeed!B:B() called.A:A() called.(2)#includeusing namespace std;clas

3、s Apublic: A(int a,int b):x(a),y(b) coutA constructor.endl; void Add(int a,int b) x+=a;y+=b; void display() cout(x,y); A()coutdestructor A.endl;private: int x,y;class B:private Aprivate: int i,j; A Aobj;public: B(int a,int b,int c,int d):A(a,b),i(c),j(d) ,Aobj(1,1) coutB constructor.endl; void Add(i

4、nt x1,int y1,int x2,int y2) A:Add(x1,y1); i+=x2; j+=y2; void display() A:display(); Aobj.display(); cout(i,j)endl; B()coutdestructor B.endl; ;int main() B b(1,2,3,4); b.display(); b.Add(1,3,5,7); b.display(); return 0;（2）程序运行结果：A constructor.A constructor.B constructor.(1,2) (1,1) (3,4)(2,5) (1,1) (

5、8,11)destructor B.destructor A.destructor A.(3)#includeusing namespace std;class Apublic: A(int a):x(a) coutA constructor.xendl; int f()return +x; A()coutdestructor A.endl;private: int x;class B:public virtual Aprivate: int y; A Aobj;public: B(int a,int b,int c):A(a),y(c),Aobj(c) coutB constructor.y

6、endl; int f() A:f(); Aobj.f(); return +y; void display() coutA:f()tAobj.f()tf()endl; B()coutdestructor B.endl; ;class C:public Bpublic: C(int a,int b,int c):B(a,b,c),A(0) coutC constructor.endl;class D:public C,public virtual Apublic: D(int a,int b,int c):C(a,b,c),A(c) coutD constructor.endl; D()cou

7、tdestructor D.endl;int main() D d(7,8,9); d.f(); d.display();return 0;（3）程序运行结果：A constructor.9A constructor.9B constructor.9C constructor.D constructor.12 12 11destructor D.destructor B.destructor A.destructor A.(4)#include using namespace std;class Base1 public: Base1() coutclass Base1!endl; ;clas

8、s Base2 public: Base2() coutclass Base2!endl; ;class Level1:public Base2,virtual public Base1public: Level1() coutclass Level1!endl; ;class Level2: public Base2,virtual public Base1public: Level2() coutclass Level2!endl; ;class TopLevel:public Level1,virtual public Level2public: TopLevel() coutclass

9、 TopLevel!endl; ;int main() TopLevel obj; return 0;（4）程序运行结果：class Base1!class Base12class Leve12!class Base2!class Leve11!class TopLeve1!2某出版系统发行图书和磁带，利用继承设计管理出版物的类。要求如下：建立一个基类Publication存储出版物的标题title、出版物名称name、单价price及出版日期date。用Book类和Tape类分别管理图书和磁带，它们都从Publication类派生。Book类具有保存图书页数的数据成员page，Tape类具有

10、保存播放时间的数据成员playtime。每个类都有构造函数、析构函数，且都有用于从键盘获取数据的成员函数inputData()，用于显示数据的成员函数display()。2、#include using namespace std;#include class Datepublic: Date() Date(int y,int m,int d); Date(Date &d); void SetDate(int y,int m,int d); void ShowDate(); private: int year,month,day;Date:Date(int y,int m,int d) yea

11、r=y; month=m; day=d; Date:Date(Date &d) year=d.year; month=d.month; day=d.day; void Date:SetDate(int y,int m,int d) year=y; month=m; day=d; void Date:ShowDate() coutyear年month月day日endl; class Timepublic: Time() Time(int h,int m,int s); Time(Time &t); void SetTime(int h,int m,int s); void ShowTime();

12、 private: int hour,minute,second;Time:Time(int h,int m,int s) hour=h; minute=m; second=s; Time:Time(Time &t) hour=t.hour; minute=t.minute; second=t.second; void Time:SetTime(int h,int m,int s) hour=h; minute=m; second=s; void Time:ShowTime() couthour:minute:secondendl; class Publicationpublic: Publi

13、cation() Publication(string title,string name,float price,int y,int m,int d); void inputData(); void display();private: string title; string name; float price; Date date;Publication:Publication(string title,string name,float price,int y,int m,int d):title(title),name(name),price(price),date(y,m,d)vo

14、id Publication:inputData() coutPlease input title, name, price, publication date of a book:titlenameprice; int year,month,day; cinyearmonthday; date.SetDate(year,month,day);void Publication:display() couttitle=titleendl; coutname=nameendl; coutprice=priceendl; coutpage=page;void Book:inputData() Pub

15、lication:inputData(); coutPlease the pages of the book:page;void Book:display() Publication:display(); coutpage=pageendl;class Tape:public Publicationpublic: Tape() Tape(string title,string name,float price,int y,int m,int d,Time playtime); void inputData(); void display();private: Time playtime;Tap

16、e:Tape(string title,string name,float price,int y,int m,int d,Time playtime):Publication(title,name,price,y,m,d),playtime(playtime)void Tape:inputData() Publication:inputData(); coutPlease the playtime of the tape:hourminutesecond; playtime.SetTime(hour,minute,second);void Tape:display() Publication

17、:display(); coutplaytime=; playtime.ShowTime();int main() Book book1(教材,C+程序设计,30.00,2009,6,1,300); book1.display(); coutendl; Time time1(30,10,20); Tape tape1(磁带,C+程序设计视频,10.00,2009,8,1,time1); tape1.display(); Book book2; book2.inputData(); book2.display(); coutendl; Tape tape2; tape2.inputData();

18、 tape2.display(); return 0;3分别定义教师类Teacher和干部类Cadre，采用多重继承的方式由这两个类派生出新类Teacher_Cadre（教师兼干部类）。要求：（1）在两个基类中都包含姓名、年龄、性别、地址、电话数据成员。（2）在Teacher类中还包含数据成员职称title，在Cadre类中还包含数据成员职务post，在Teacher_Cadre类中还包含数据成员工资wage。（3）对两个基类中的姓名、年龄、性别、地址、电话数据成员用相同的名字，在访问这类数据成员时，指定作用域。（4）在类体中声明成员函数，在类外定义成员函数。（5）在派生类Teacher_Ca

19、dre的成员函数show中调用Teacher类中的display函数，输出姓名、年龄、性别、地址、电话，然后再用cout语句输出职务和工资。3、#include#include using namespace std;class Teacher public: Teacher(string nam,int a,char s,string tit,string ad,string t); void display(); protected: string name; int age; char sex; string title; string addr; string tel;Teacher:

20、Teacher(string nam,int a,char s,string tit,string ad,string t): name(nam),age(a),sex(s),title(tit),addr(ad),tel(t) void Teacher:display() coutname:nameendl; coutageageendl; coutsex:sexendl; couttitle:titleendl; coutaddress:addrendl; couttel:telendl; class Cadre public: Cadre(string nam,int a,char s,

21、string p,string ad,string t); void display(); protected: string name; int age; char sex; string post; string addr; string tel; ; Cadre:Cadre(string nam,int a,char s,string p,string ad,string t): name(nam),age(a),sex(s),post(p),addr(ad),tel(t)void Cadre:display() coutname:nameendl; coutage:ageendl; c

22、outsex:sexendl; coutpost:postendl; coutaddress:addrendl; couttel:telendl;class Teacher_Cadre:public Teacher,public Cadre public: Teacher_Cadre(string nam,int a,char s,string tit,string p,string ad,string t,float w); void show( ); private: float wage; ; Teacher_Cadre:Teacher_Cadre(string nam,int a,ch

23、ar s,string t,string p,string ad,string tel,float w): Teacher(nam,a,s,t,ad,tel),Cadre(nam,a,s,p,ad,tel),wage(w) void Teacher_Cadre:show( ) Teacher:display(); coutpost:Cadre:postendl; coutwages:wageendl;int main( ) Teacher_Cadre te_ca(Wang-li,50,f,prof.,president,135 Beijing Road,Shanghai,(021)612345

24、67,1534.5); te_ca.show( ); return 0;4按下列要求编写程序。（1）定义一个分数类Score。它有3个数据成员：Chinese /语文课成绩English /英语课成绩Mathematics /数学课成绩2个构造函数：无参的和带参数的3个成员函数：是否带参数根据需要自定sum() /计算三门课总成绩print() /输出三门课成绩和总成绩modify() /修改三门课成绩（2）定义一个学生类Student。它有3个数据成员：Num /学号Name /姓名MyScore /成绩2个构造函数：无参的和带参数的3个成员函数：是否带参数根据需要自定sum() /计算某学

25、生三门课总成绩print() /输出某学生学号、姓名和成绩modify() /修改某学生学号、姓名和成绩（3）在主函数中，先定义一个学生类对象数组，再通过for循环给对象数组赋上实际值，最后输出对象数组个元素的值。4、#include#includeusing namespace std;class scorepublic: score() chinese=0; english=0; mathematics=0; score(float ch,float en,float ma):chinese(ch),english(en),mathematics(ma) float sum(); void

26、 print(); void modify(); private: float chinese; float english; float mathematics;class studentpublic: student(): myscore(0,0,0) num=000000000; name=无; student(string n,string na,float m,float c,float e):num(n),name(na),myscore(m,c,e) float sum(); void print(); void modify(); private: string num; stri